07 mobile prefixes explained: which network owns which range

Almost every mobile number in the UK begins 07 — it is the unmistakable signature of a UK mobile, as opposed to a landline's geographic 01 or 02 code. But beyond that first clue, the 07 ranges hold a lot of detail that people get wrong: the idea that the next few digits reliably tell you which network a number is on, or that a particular 07 prefix is 'a scam range'. This guide explains how the 071 to 079 mobile ranges are structured and allocated to operators, why number porting means the prefix can no longer reliably identify the current network, the one important exception (the 070 'personal numbers' that look like mobiles but are not), and — most usefully — how to actually check who is behind a specific 07 number.

#How the 07 ranges are structured

UK mobile numbers sit in the 07 range, and within that, the numbering plan divides numbers into blocks identified by the digits that follow. The active mobile ranges run across 071 through 079 (you will see numbers beginning 074, 075, 077, 078 and 079 very commonly, for example). Ofcom — the communications regulator — allocates these blocks to mobile network operators, who then issue individual numbers to customers. So when you see a number like 07700 900000, the 07700 part identifies a specific block that was allocated to a particular operator. A full UK mobile number is eleven digits: the 07 prefix plus nine more. This structure is consistent and predictable, which is why the *format* of an 07 number is a reliable signal that you are looking at a UK mobile — even though, as we will see, the specific operator behind it is far less certain than the prefix suggests. For how this fits into the wider UK numbering system, see our how Ofcom numbering works guide and the UK phone number format guide.

#Which network owns which 07 range?

Historically, you could look at the first few digits of a mobile number and make a decent guess at the network, because Ofcom allocated specific blocks to specific operators — one range to a given network, another to another. Our UK mobile networks by 07 prefix guide maps out how the ranges were originally allocated. But here is the crucial catch that trips everyone up: that mapping tells you the original range holder, not necessarily the network serving the number today. The reason is number porting, which we explain next. So while the allocation data is real and useful for understanding the structure, you should treat 'which network owns this range' as a question about history, not a reliable answer to 'which network is this specific number on right now'. For the purpose of working out who called you, the operator matters far less than the number's actual reputation and behaviour.

#Why porting breaks the prefix-to-network mapping

When mobile number portability was introduced, it became possible to keep your number when you switch networks. That is great for consumers — you are not locked to a network by the hassle of changing your number — but it means the prefix no longer reliably indicates the current network. Someone whose number sits in a block originally allocated to Network A may have ported to Network B years ago, while keeping the same digits. Multiply that across millions of switches over the years, and the original allocation becomes an unreliable guide to who actually serves any given number now. This is why services that claim to tell you 'the network' purely from the prefix can be wrong: without checking live porting data, the prefix is just the starting point. The honest position is that the prefix tells you it is a UK mobile and which operator was *first* allocated the block, and that is as far as it reliably goes. To switch and keep your own number, you request a PAC code — the same portability mechanism that scrambles the prefix-to-network mapping.

#Are some 07 ranges 'scam ranges'?

A persistent myth is that particular 07 prefixes are inherently dodgy — that an 07xxx range is 'a scam range'. It is not true in the way people mean. Mobile numbers, across all the 07 ranges, are cheap and easy to obtain in volume, which makes them attractive to high-volume callers: marketing operations dialling huge lists, automated robocall systems, and outright scammers who churn through fresh numbers to dodge blocking. Because those callers cycle through whatever numbers are available, a share of their activity inevitably lands in any popular block, and so that block accumulates complaints over time. But the range itself is just ordinary mobile numbering — the same ranges are full of perfectly genuine personal and business numbers. The lesson is the familiar one: judge the specific number, not the prefix. A single 07 number with a cluster of recent, consistent scam reports is one to avoid; the range it belongs to is not 'a scam range'. Blanket-distrusting a whole prefix would mean ignoring countless legitimate callers who happen to share it.

#The important exception: 070 'personal numbers'

There is one genuinely important trap in the 07 space, and it is worth understanding clearly because it can be expensive. 070 numbers are not mobiles. They are 'personal numbers' or 'follow-me' numbers — a service that forwards calls to wherever the owner happens to be — and although they look like a mobile at a glance (they start 07), they can cost considerably more to call than a normal mobile, sometimes far more. Scammers and some services have exploited the visual similarity, hoping people will mistake an 070 number for an ordinary 07x mobile. The defence is simple: look closely at the digits. A genuine mobile starts 071–079 *excluding* 070; a number that begins specifically 070 is a personal number, and you should check the cost before calling it. If an unexpected message or missed call invites you to ring back a number beginning 070, be especially cautious — it is one of the classic ways people are lured into expensive call-backs. Our number types overview explains how 070 differs from real mobiles and from other ranges.

#The displayed 07 number can be faked

Even once you understand the ranges and porting, there is a final reason the prefix cannot tell you who is calling: caller-ID spoofing. The number shown on your screen is set by the calling system and is not independently verified by the network as genuinely belonging to the caller. That means a scammer can display a perfectly ordinary-looking 07 mobile number to disguise where a call really comes from. UK networks are deploying caller-ID authentication to make spoofing harder, but it is not yet universal, so the displayed 07 number remains a clue rather than proof. This is why, for anything involving money, accounts or security, you should never rely on the number shown — verify through an independently sourced contact instead. Our who called me? guide covers how to weigh a call's behaviour alongside the number.

#How to check a specific 07 number

1. 1

   Don't call back blind

   Note the full 07 number. Calling an unknown mobile back before checking is how some scams (and pricey 070 call-backs) draw people in.

2. 2

   Look it up

   Type the full number into the lookup on this site to see its details, internet footprint and any community reports.

3. 3

   Search it online

   Put the number in quotes in a search engine. Genuine callers may surface a business listing; nuisance numbers tend to surface complaints.

4. 4

   Check the leading digits

   Confirm it is a real mobile (071–079) and not an 070 personal number, which can cost much more to call.

5. 5

   Decide and act

   If it looks genuine, you can call back. If it carries scam reports or you are unsure, block it. For anything about money, verify on an independently sourced number.

This method works for any 07 number regardless of which range it falls in, because it judges the specific number rather than guessing from the prefix. You can also browse the 07 ranges and how they break down on our 07 mobile ranges page.

#Why the lookup beats reading the prefix

Pulling all of this together explains why a proper number check is so much more reliable than staring at the prefix. The prefix can tell you it is a UK mobile (or warn you it is an 070 personal number), and it can tell you which operator was originally allocated the block — but porting means the current network is uncertain, spoofing means the displayed number might not be the real origin, and the cheap-and-disposable nature of mobile numbers means a range's reputation says little about any individual number. A good lookup cuts through all of that by checking the specific number against official allocation data plus an internet check and any community reports, so you get a picture of that particular number rather than a guess based on its first few digits. That is the whole reason this site checks numbers the way it does: the prefix is where understanding starts, and the specific-number check is where useful answers come from.

#Why high-volume callers favour mobile numbers

To really understand why 07 ranges fill with complaints, it helps to see the economics from the caller's side. For a legitimate business making a handful of calls, the number is incidental. But for an operation dialling tens of thousands of numbers a day — a lead-generation marketer, an automated survey system, or a fraud ring — the phone number is a consumable. Mobile numbers suit this perfectly: they are cheap to obtain, can be acquired in bulk through various routes, and can be discarded the moment they start getting blocked or reported. The result is constant churn: a number is used heavily for a short burst, accumulates reports, gets blocked by enough people to lose its value, and is replaced by a fresh one. Across millions of such numbers cycling through the system, popular 07 blocks inevitably pick up a trail of complaints — not because the block is special, but because it is part of the pool these operations draw from. Understanding this churn explains both why blocking individual numbers can feel like an endless game, and why a range's reputation tells you so little about any specific number within it.

The automated dimension matters too. A lot of nuisance calls come from autodiallers that ring huge lists and only connect a human agent when someone answers — which is why you sometimes pick up to a few seconds of silence, or to no one at all. Responding to a recorded 'press 1 to opt out' prompt usually backfires: it confirms to the system that your number is live and answered by a real person, which can increase the calls you get. The cleanest response to a suspected automated or scam call is to hang up without interacting, then block and, where appropriate, report the number. None of this requires you to identify the human behind the 07 number; the defensive moves work regardless. And because the numbers are disposable, the most durable protection is not chasing individual blocks but building the habit of not engaging with unknown calls and checking numbers before you act on them — which brings us back to why a per-number lookup beats trying to memorise 'bad' prefixes.

#A realistic example: an unknown 07 missed call

Picture the common scenario: you glance at your phone and see a missed call from an 07 number you do not recognise, with no voicemail. Here is the calm way through it, and it applies to almost any unknown mobile. First, resist the urge to call straight back — a missed call from an unknown number is not an emergency, and calling back blind is exactly the behaviour some scams rely on, especially the 'wangiri' trick that rings once to tempt an expensive call-back. Second, take ten seconds to look the number up and search it in quotes online. If it belongs to a genuine business, you will often find their own website or listing; if it is a known nuisance number, you will tend to find complaint threads describing the same experience. Third, check the leading digits to confirm it is a real mobile (071–079) and not an 070 personal number, which can cost much more to call back.

If your check turns up nothing alarming and the number could plausibly be a delivery, a tradesperson you contacted, or a call you are expecting, it is reasonable to ring back — and if it is genuine, the person will explain who they are. If instead the number carries scam reports, or if anyone who answers starts pressuring you, claims to be your bank, or asks for codes or payment, end the call and treat it as a scam. For anything touching your money or accounts, never use the number that called: hang up and reach the organisation on a number you find independently — your card, a statement, the official website, or 159 for your bank's fraud team. This single routine — pause, check, verify independently if money is involved — handles the overwhelming majority of unknown 07 calls without stress, regardless of which range the number falls in. Our who called me? guide covers it in full.

#Genuine callers behind unknown 07 numbers

It is easy, after reading about scams and nuisance calls, to start treating every unknown 07 number as a threat — but that would mean missing a great deal of perfectly ordinary, legitimate contact, so it is worth picturing the genuine callers too. Delivery and courier drivers are a major one: most now call or text from a mobile to confirm they are nearby or to arrange a redelivery, and because driver rosters change constantly the number is rarely saved. Tradespeople and contractors return enquiries from their own mobiles, often while out on a job. Recruiters and hiring managers use mobiles for first, informal calls about roles. Healthcare is increasingly mobile-based, with GP surgeries, hospital departments and clinics sometimes calling patients from mobile numbers rather than a switchboard. Add friends or relatives ringing from a new phone or replacement SIM, colleagues on work mobiles, landlords and letting agents, tutors, club organisers, and the many small businesses that run entirely on a couple of handsets, and you have an enormous pool of legitimate 07 traffic. None of these will be in your contacts the first time they call.

The point of listing them is not to make you assume every 07 call is friendly — plenty are not — but to stop you treating an unknown mobile as automatically sinister. The right reflex is neutral curiosity: an unknown 07 number is simply a question to answer, and the tools to answer it take under a minute. If you missed the call and no voicemail was left, a quick lookup plus a glance at any reports usually tells you whether it is worth returning; and you can always let an unknown number ring out next time and wait to see whether a genuine caller follows up by text or message. This balanced stance — neither paranoid nor careless — is exactly what the per-number checking habit supports, and it is far less tiring than treating every ring as a potential threat. You do not need to fear the 07 range or memorise 'bad' prefixes; you just need a simple routine for the unknown numbers that do come in, applied calmly each time. That routine catches the nuisance and scam calls while letting the deliveries, clinics and tradespeople through, which is the outcome everyone actually wants. In other words, the prefix is the beginning of the story, not the end: it tells you that you are looking at a UK mobile, and from there a quick check of the specific number does the real work of telling you whether it is a caller worth answering or one worth blocking. That small shift in approach — from judging the prefix to checking the number — is what turns the whole confusing topic into something simple and manageable.

#Bottom line

Every UK mobile starts 07 (the 071–079 ranges), with the following digits originally allocated by Ofcom to specific networks — but porting means the prefix shows the original range holder, not necessarily the current network. No 07 range is inherently 'a scam range'; reports cluster in popular blocks because high-volume callers churn through cheap mobile numbers. Watch out for 070 personal numbers, which look like mobiles but can cost far more to call, and remember the displayed number can be spoofed. So to find out who actually called from an 07 number, do not read the prefix — look the specific number up, check its reports, and verify independently for anything about money. See UK mobile networks by 07 prefix for the range map and who called me? for the full checking routine.